Intake Manifold Gasket

This procedure covers the removal and replacement of the intake manifold gaskets on the 5.0L Coyote V8 engine, including removal of fuel system components, throttle body, and various sensors.

Warnings

Tools required

Parts

• Intake manifold gasket set × 1 — Use OEM Ford specification
• Throttle body gasket × 1 — Use OEM specification
• PCV valve grommet × 1 — Inspect and replace if damaged
• Coolant (additional) × 1 — Motorcraft Orange

Fluids

• Motorcraft Orange Coolant — 2 qt

Preparation

1. Ensure engine is completely cold before beginning work
2. Disconnect negative battery cable and wait at least 2 minutes
3. Remove engine cover by pulling upward on cover (press-fit clips)
4. Place drain pan under radiator and drain coolant from radiator petcock and engine block drain plugs
5. Relieve fuel system pressure by removing fuel pump fuse and attempting to start engine until it dies
6. Remove air intake tube and air filter housing assembly
7. Label all vacuum hoses, electrical connectors, and fuel lines with tape for reassembly reference

Procedure

1. 1

   Disconnect electrical and vacuum connections
   Disconnect the following from the intake manifold and throttle body: throttle position sensor connector, idle air control connector (if equipped), MAP sensor, PCV hose, brake booster vacuum line, EVAP purge valve connector and hose, and all other vacuum lines connected to the intake manifold. Take photos or label each connection for reference during reassembly.
2. 2

   Remove throttle body
   Disconnect the throttle body coolant hoses (if equipped) and remove the four throttle body mounting bolts. Carefully remove the throttle body from the intake manifold and set aside. Inspect the gasket and replace if damaged.
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
3. 3

   Disconnect fuel system
   Using fuel line disconnect tools, carefully disconnect the fuel supply line from the fuel rail. Have rags ready to catch any residual fuel. Disconnect the fuel injector electrical harness by releasing the clips on each injector connector. Remove the fuel rail mounting bolts and carefully lift the fuel rail with injectors still attached. Set aside in a clean area.
   ⚠Keep fuel rail and injectors clean and protected from debris. Do not allow injector tips to contact any surface.
   Torque spec

   Fuel Rail Bolts12 Nm (9 lb-ft)
4. 4

   Remove EGR valve and coolant crossover
   If equipped with EGR, disconnect the EGR valve electrical connector and vacuum lines. Remove the EGR valve mounting bolts and set the valve aside. Remove the coolant crossover pipe bolts if present on your model year, and carefully remove the crossover. Expect coolant spillage from the crossover.
   ⚠Have drain pan ready as coolant will drain from crossover passages when removed.
5. 5

   Remove PCV valve and remaining connections
   Remove the PCV valve from the valve cover by twisting counterclockwise and pulling upward. Check the grommet for damage. Disconnect any remaining coolant hoses, vacuum lines, or brackets attached to the intake manifold.
6. 6

   Remove intake manifold mounting bolts
   Remove all intake manifold mounting bolts in reverse order of the tightening sequence (outside to center pattern). There are typically 10 bolts securing the intake manifold. Keep bolts organized and inspect for damage. Note the location of any different length bolts.
   ℹ️Bolts should be removed in reverse of installation sequence to prevent manifold warping.
7. 7

   Remove intake manifold
   Carefully lift the intake manifold straight up and away from the engine. The manifold may require gentle prying at the designated pry points (check service manual for locations). Do not pry between gasket surfaces. Remove and discard old gaskets from both the manifold and cylinder head surfaces.
   ⚠Never pry between aluminum sealing surfaces as this can cause damage requiring expensive repairs.
8. 8

   Clean gasket surfaces
   Using a plastic gasket scraper, carefully remove all old gasket material from the cylinder head and intake manifold mating surfaces. Use brake cleaner and lint-free rags to thoroughly clean all surfaces. Inspect for damage, warping, or cracks. Ensure no debris falls into cylinder head ports by stuffing clean rags into the intake ports temporarily.
   ⚠️Do not allow any debris or gasket material to fall into the engine. This can cause catastrophic engine damage.
   ⚠Use only plastic scrapers on aluminum surfaces. Metal scrapers will gouge the soft aluminum and cause leak paths.
9. 9

   Install new gaskets and position manifold
   Remove the protective rags from intake ports. Position the new intake manifold gaskets on the cylinder heads, ensuring alignment pins (if present) are properly seated. Some gaskets may have adhesive backing. Carefully lower the intake manifold onto the gaskets, ensuring proper alignment with all bolt holes. Do not allow the manifold to shift once placed.
   ℹ️Do not use additional sealant unless specifically required by gasket manufacturer instructions.
10. 10

    Install and torque intake manifold bolts
    Install all intake manifold bolts hand-tight, ensuring proper engagement. Using a torque wrench, tighten the bolts to 25 Nm (18 lb-ft) in the proper sequence: start at the center bolts and work outward in a crossing pattern. Make at least two complete passes through the sequence to ensure even loading.
    ⚠Critical: Must follow center-out tightening sequence to prevent gasket failure and leaks. Refer to service manual for exact sequence diagram.
    Torque spec

    Intake Manifold Bolts25 Nm (18 lb-ft)
11. 11

    Reinstall PCV valve and EGR components
    Install the PCV valve into the valve cover grommet (replace grommet if damaged) and torque to specification. If equipped, reinstall the coolant crossover with new gaskets/O-rings and torque bolts to specification. Reinstall the EGR valve with new gasket and torque bolts to specification.
12. 12

    Reinstall fuel rail and injectors
    Carefully position the fuel rail assembly with injectors back onto the intake manifold, ensuring all injector O-rings are properly seated in their bores. Install fuel rail mounting bolts and torque to specification. Reconnect all fuel injector electrical connectors. Reconnect the fuel supply line, ensuring it clicks into place securely.
    Torque spec

    Fuel Rail Bolts12 Nm (9 lb-ft)
13. 13

    Reinstall throttle body
    Install a new throttle body gasket onto the intake manifold. Position the throttle body and install mounting bolts. Torque bolts to specification in a crossing pattern. Reconnect throttle body coolant hoses if equipped.
    Torque spec

    Throttle Body Bolts10 Nm (7 lb-ft)
14. 14

    Reconnect all electrical and vacuum connections
    Reconnect all electrical connectors, vacuum hoses, and coolant hoses using your labels and photos as reference. Ensure all connections are fully seated and secured. Double-check that no connections were missed.
    ℹ️Verify each connection against your reference photos to ensure nothing is missed.
15. 15

    Refill coolant and final checks
    Reinstall the air intake system and engine cover. Refill the cooling system with the proper coolant mixture. Reconnect the negative battery cable. Before starting the engine, turn the key to the ON position (without starting) for 5 seconds, then OFF. Repeat this 3 times to prime the fuel system. Inspect for any fuel leaks around the fuel rail connections.

Reassembly

1. Ensure all bolts are torqued to specification in proper sequence
2. Verify all electrical connectors are fully seated with locking tabs engaged
3. Confirm all vacuum lines are connected to correct ports
4. Check that fuel line is properly connected and locked
5. Verify PCV valve is properly seated in grommet

Verification

• Start the engine and allow it to idle. Listen for any vacuum leaks (hissing sounds) around the intake manifold
• Check for fuel leaks around fuel rail and fuel line connections while engine is running
• Verify engine idles smoothly without hesitation or rough running
• Check for coolant leaks around intake manifold, coolant crossover, and throttle body after engine reaches operating temperature
• Scan for diagnostic trouble codes using OBD-II scanner to verify no fuel trim or sensor issues
• Road test vehicle to verify normal acceleration and throttle response under load
• After initial test drive, allow engine to cool and recheck all bolts for proper torque, and recheck coolant level

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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